Fix delete if container-runtime doesn't exist

[spowelljr]

Before:

$ minikube delete

❌  Exiting due to MK_NEW_RUNTIME: Failed to create runtime: unknown runtime type: "nvidia-docker"

╭───────────────────────────────────────────────────────────────────────────────────────────╮
│                                                                                           │
│    😿  If the above advice does not help, please let us know:                             │
│    👉  https://github.com/kubernetes/minikube/issues/new/choose                           │
│                                                                                           │
│    Please run `minikube logs --file=logs.txt` and attach logs.txt to the GitHub issue.    │
│    Please also attach the following file to the GitHub issue:                             │
│    - /tmp/minikube_delete_8e4d16ba2ead342287e31d85ea41bad14bfe469f_0.log                  │
│                                                                                           │
╰───────────────────────────────────────────────────────────────────────────────────────────╯

After:

$ minikube delete
🔥  Deleting "minikube" in docker ...
🔥  Deleting container "minikube" ...
🔥  Removing /usr/local/google/home/powellsteven/.minikube/machines/minikube ...
💀  Removed all traces of the "minikube" cluster.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: spowelljr

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [spowelljr]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[medyagh]

/ok-to-test

[minikube-pr-bot]

kvm2 driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 17347) |
+----------------+----------+---------------------+
| minikube start | 50.0s    | 50.2s               |
| enable ingress | 28.2s    | 28.6s               |
+----------------+----------+---------------------+

Times for minikube ingress: 29.2s 27.2s 28.2s 28.6s 28.1s
Times for minikube (PR 17347) ingress: 29.1s 29.6s 27.7s 28.7s 28.2s

Times for minikube start: 49.5s 49.5s 51.0s 50.1s 50.0s
Times for minikube (PR 17347) start: 51.6s 47.9s 50.5s 49.6s 51.3s

docker driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 17347) |
+----------------+----------+---------------------+
| minikube start | 22.6s    | 23.1s               |
| enable ingress | 20.8s    | 21.5s               |
+----------------+----------+---------------------+

Times for minikube start: 23.6s 21.8s 23.9s 21.6s 22.0s
Times for minikube (PR 17347) start: 21.5s 21.6s 25.2s 22.4s 24.6s

Times for minikube ingress: 20.8s 20.8s 20.8s 20.8s 20.9s
Times for minikube (PR 17347) ingress: 22.3s 20.8s 20.8s 22.8s 20.8s

docker driver with containerd runtime

+-------------------+----------+---------------------+
|      COMMAND      | MINIKUBE | MINIKUBE (PR 17347) |
+-------------------+----------+---------------------+
| minikube start    | 22.3s    | 22.1s               |
| ⚠️  enable ingress | 26.7s    | 34.5s ⚠️             |
+-------------------+----------+---------------------+

Times for minikube start: 21.0s 23.5s 23.4s 23.0s 20.7s
Times for minikube (PR 17347) start: 23.5s 20.7s 23.3s 20.5s 22.5s

Times for minikube ingress: 19.3s 31.3s 32.3s 31.3s 19.4s
Times for minikube (PR 17347) ingress: 31.3s 31.4s 47.3s 31.3s 31.3s

[minikube-pr-bot]

These are the flake rates of all failed tests.

Environment	Failed Tests	Flake Rate (%)
KVM_Linux_crio	TestStartStop/group/default-k8s-diff-port/serial/Pause (gopogh)	0.00 (chart)
KVM_Linux	TestStoppedBinaryUpgrade/Upgrade (gopogh)	0.00 (chart)
Hyperkit_macOS	TestNetworkPlugins/group/calico/Start (gopogh)	1.89 (chart)
KVM_Linux	TestStartStop/group/default-k8s-diff-port/serial/VerifyKubernetesImages (gopogh)	3.12 (chart)
Hyperkit_macOS	TestImageBuild/serial/Setup (gopogh)	3.77 (chart)
KVM_Linux	TestStartStop/group/default-k8s-diff-port/serial/AddonExistsAfterStop (gopogh)	3.91 (chart)
KVM_Linux	TestStartStop/group/default-k8s-diff-port/serial/Pause (gopogh)	3.91 (chart)
KVM_Linux	TestStartStop/group/default-k8s-diff-port/serial/SecondStart (gopogh)	3.91 (chart)
KVM_Linux	TestStartStop/group/default-k8s-diff-port/serial/UserAppExistsAfterStop (gopogh)	3.91 (chart)
QEMU_macOS	TestFunctional/parallel/PersistentVolumeClaim (gopogh)	6.78 (chart)
QEMU_macOS	TestFunctional/parallel/TunnelCmd/serial/RunSecondTunnel (gopogh)	49.15 (chart)

To see the flake rates of all tests by environment, click here.